Wiseco 4798M03900 High-Performance Piston Kit Bore Compression - 39mm 11 1

The Wiseco 4798M03900 is a high-performance piston kit engineered for 4-stroke dirt bike engines. This complete piston assembly features a standard 39.00mm bore diameter and delivers an enhanced 11:1 compression ratio for improved power and throttle response.

Key Features:

• Forged from high-silicon, low-expansion aluminum alloy for superior strength and durability
• Precision CNC machined with diamond-turned finish for consistent sizing and optimal performance
• 11:1 compression ratio increases horsepower and torque output
• Compatible with all modern cylinder bore compositions including cast iron, chrome, Nikasil, and boron composite
• Complete kit includes piston, rings, wrist pin, and circlips
• Designed for lighter weight and higher RPM capability compared to cast pistons

This piston kit is designed for serious riders seeking maximum performance and longevity. Wiseco pistons are built with over 60 years of racing heritage and are manufactured in the USA using aerospace-grade materials and state-of-the-art forging technology. Note that Wiseco replacement ring sets must be used with Wiseco pistons, and the wrist pin included is not OEM interchangeable.

Cross-Reference Part Numbers: OEM 13101-GBZ-701, Namura NX-10051, ProX 01.1040